AUGUST 25, 2026
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Case File

CVE-2026-55418

HIGH · CVSS 8.6 EPSS 0.30% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-07 · Last synced 2026-08-06

CyberRota Analysis

AI-Generated

FastGPT versions prior to v4.15.0-beta5 are vulnerable due to improper authorization in file handlers, allowing attackers to access S3 objects by supplying keys from other teams. This could lead to unauthorized data exposure, compromising sensitive information stored within the platform. Organizations using FastGPT should prioritize upgrading to the latest version to mitigate this high-severity risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-55418
Severity
HIGH
CVSS
8.6
EPSS
0.30%

Original NVD Description

FastGPT is an open source AI knowledge base platform. Prior to v4.15.0-beta5, two FastGPT file handlers authorize an unrelated resource and then sign or read an S3 object using a key taken directly from the request, without checking that the key belongs to the caller's team. Because S3 object keys are global within the bucket and carry the tenant id only as a path segment, an attacker can supply another team's key and obtain its file contents through the chat-file presign endpoint or dataset preview endpoint. This issue is fixed in version v4.15.0-beta5.